I've heard that before, but never had a chance to read any of them yet :-/ Also heard similar thing about the Ringworld books, and I have read all of them. They were alright.
Logged
"...Dogar And Kazon Clack Their Mandibles Against One Another And Snicker With Amusement."
Ringworld and Star Control? Well - 1: Spathi and Puppeteers are similar in their skittishness. However, Spathi aren't galactic traders and information exchangers. I just can't see Niffiwan or Fwiffo doing the elaborate Pupetteer blackmail procedure.
2: Ancient telepathic enslavers ( Slavers, Dnyarri). However, the Slavers were the source of all ancient tech artifacts. Maybe there was a race before them, but it was their toys (or the Tnuctipun) that people find - not a race even more ancient (the Precursors)
Anything else? Certainly there is SO much original material that I don't see a pattern of borrowing. Not even enough to sense an homage.
Yeah the Progenitors == the Precursors. Also earthlings are not major galactic forces in either, they're just kinda space dickweeds. On the other hand, Brin has a galactic civilisation, while SC has a kind of stellar/racial city-state thing going on.